Graphmatica supports a number of variations of logarithmic graph paper. In order to simplify the Graph Paper dialog box, these choices have been placed in a sub-dialog, Log Paper Options. To reach it, click on the Log Options tab in the Graph Paper dialog box.
You can set the base for your logarithmic paper using the top part of this dialog. For convenience, base 10 and natural log can be selected using radio buttons, or you can enter an arbitrary (greater than zero, though!) value for the base in the edit field.
You can also choose between bode plot, semi-log and log-log paper using the bottom half of this dialog. (Bode plot paper is logarithmic in scale along the x-axis only. Semi-log means logarithmic along the y-axis only, the x-axis remains linear.)